I think I found a bug on Gambit-C's build process during building for iOS.
Hi. I'm Hoon Hwangbo, and currently trying to build Gambit-C for Apple's iOS platforms. I think I found a bug on Gambit-C's build process. Please reply your opinions.
I started with cross-compiling whole source code with iOS SDK. I followed 'jlongster''s method described on:
http://jlongster.com/legacy/scheme-iphone-apps.html
I had succeed building for iOS device. `libgambc.a` linked and executed well. But I met some errors during building for iOS simulator. (iOS has 2 kind of platforms, I'll describe about this later section)
This is first error.
os_io.c: In function ‘___device_stream_kind_from_fd’: os_io.c:5835: error: storage size of ‘s’ isn’t known make[1]: *** [os_io.o] Error 1 make: *** [all-recursive] Error 1
The line at source code is,
struct ___stat s;
`___stat` is typedef-ed as `stat`. I don't know why, however, it couldn't be compiled. I just modified the code uing `stat` type directly.
struct stat s;
Compilation continued. And another error pop up.
os.c: In function ‘___os_file_info’: os.c:1488: error: storage size of ‘s’ isn’t known make[1]: *** [os.o] Error 1 make: *** [all-recursive] Error 1
Exactly same error and exactly same source code. I modified it as same as above. Compilation continued. Build complete without additional error. It's linked but failed to be executed. It raised a runtime error:
Detected an attempt to call a symbol in system libraries that is not present on the iPhone: fstat64 called from function ___device_stream_setup_from_fd in image gambit-c-test3. If you are encountering this problem running a simulator binary within gdb, make sure you 'set start-with-shell off' first. Program received signal: “SIGABRT”.
I felt there is an error about determining environment is 32-bit or 64-bit. Because iOS simulator is completely 32bit environment. I rollbacked all changes. I searched `fstat64` from all source code, and I found it's on 'include/configure.h'. It's marked like this.
#define HAVE_STAT64 1
I changed it like this.
#define HAVE_STAT64 0
Compilation failed again exactly same with first 2 errors. I didn't modified the code like before. Instead of, I looked at 'os.h'. There was a code block.
#ifdef HAVE_STAT64 #define USE_stat #define ___stat stat64 #define ___lstat lstat64 #define ___fstat fstat64 #else #ifdef HAVE_STAT #define USE_stat #define ___stat stat #define ___lstat lstat #define ___fstat fstat #endif #endif
I modified it like this to force using only 32-bit functions.
/* #ifdef HAVE_STAT64 #define USE_stat #define ___stat stat64 #define ___lstat lstat64 #define ___fstat fstat64 #else #ifdef HAVE_STAT */ #define USE_stat #define ___stat stat #define ___lstat lstat #define ___fstat fstat /* #endif #endif */
And finally… It worked! Compiled well, linked well, executed well! I don't know why it was configured using 64-bit functions. Maybe the bug in the tool-chain, but it should be evaded to support iOS.
It's working now, but I can't sure my modification is correct. Maybe it's not correct. My modification destructs #ifdef logic. I didn't analyze all the logic. There were test codes, but I don't know how to execute the test. (Can you let me know how to execute the test...?) I'm not good at low-level system programming. I'm just a programmer who want to embed nice scripting system with functional language into my app. I'm newbie on `make` tool-chain and complete newbie on Scheme :)
I wish this errors to be corrected. Maybe building for iOS is not so important, this errors may a sign of another bug. Please review the codes at the positions.
PS. My environment: - Mac OS X 10.6 Snow Leopard - iOS SDK 4.2 - Gambit-C 4.6 source code of version
iOS platform description. ====================== There are 2 kind of iOS platform.
- iOS Device. This is real hardware platform composed of ARM(32bit)+darwin(32bit) - iOS Simulator. This is simulated platform on Mac OS X. Composed of x86(32bit)+darwin(32bit) This is not a full emulator. It's behaves a little differently with iOS Device platform.
So, Apple offers SDK with 2 versions of development tool-chains. Each version contains modified version of GCC for each platform.
CONTACT + Hwangbo Hoon + iPhone: +82 10 4583 3612 + Twitter: http://twitter.com/#!/eonilc + Blog: http://blog.eonil.com/ (Korean)
Afficher les réponses par date
Oh, the bug already discovered and patched! I'm sorry about posting duplicated issue.
On Feb 21, 2011, at 12:04 AM, Eonil wrote:
Hi. I'm Hoon Hwangbo, and currently trying to build Gambit-C for Apple's iOS platforms. I think I found a bug on Gambit-C's build process. Please reply your opinions.
I started with cross-compiling whole source code with iOS SDK. I followed 'jlongster''s method described on:
http://jlongster.com/legacy/scheme-iphone-apps.html
I had succeed building for iOS device. `libgambc.a` linked and executed well. But I met some errors during building for iOS simulator. (iOS has 2 kind of platforms, I'll describe about this later section)
This is first error.
os_io.c: In function ‘___device_stream_kind_from_fd’: os_io.c:5835: error: storage size of ‘s’ isn’t known make[1]: *** [os_io.o] Error 1 make: *** [all-recursive] Error 1
The line at source code is,
struct ___stat s;
`___stat` is typedef-ed as `stat`. I don't know why, however, it couldn't be compiled. I just modified the code uing `stat` type directly.
struct stat s;
Compilation continued. And another error pop up.
os.c: In function ‘___os_file_info’: os.c:1488: error: storage size of ‘s’ isn’t known make[1]: *** [os.o] Error 1 make: *** [all-recursive] Error 1
Exactly same error and exactly same source code. I modified it as same as above. Compilation continued. Build complete without additional error. It's linked but failed to be executed. It raised a runtime error:
Detected an attempt to call a symbol in system libraries that is not present on the iPhone: fstat64 called from function ___device_stream_setup_from_fd in image gambit-c-test3. If you are encountering this problem running a simulator binary within gdb, make sure you 'set start-with-shell off' first. Program received signal: “SIGABRT”.
I felt there is an error about determining environment is 32-bit or 64-bit. Because iOS simulator is completely 32bit environment. I rollbacked all changes. I searched `fstat64` from all source code, and I found it's on 'include/configure.h'. It's marked like this.
#define HAVE_STAT64 1
I changed it like this.
#define HAVE_STAT64 0
Compilation failed again exactly same with first 2 errors. I didn't modified the code like before. Instead of, I looked at 'os.h'. There was a code block.
#ifdef HAVE_STAT64 #define USE_stat #define ___stat stat64 #define ___lstat lstat64 #define ___fstat fstat64 #else #ifdef HAVE_STAT #define USE_stat #define ___stat stat #define ___lstat lstat #define ___fstat fstat #endif #endif
I modified it like this to force using only 32-bit functions.
/* #ifdef HAVE_STAT64 #define USE_stat #define ___stat stat64 #define ___lstat lstat64 #define ___fstat fstat64 #else #ifdef HAVE_STAT */ #define USE_stat #define ___stat stat #define ___lstat lstat #define ___fstat fstat /* #endif #endif */
And finally… It worked! Compiled well, linked well, executed well! I don't know why it was configured using 64-bit functions. Maybe the bug in the tool-chain, but it should be evaded to support iOS.
It's working now, but I can't sure my modification is correct. Maybe it's not correct. My modification destructs #ifdef logic. I didn't analyze all the logic. There were test codes, but I don't know how to execute the test. (Can you let me know how to execute the test...?) I'm not good at low-level system programming. I'm just a programmer who want to embed nice scripting system with functional language into my app. I'm newbie on `make` tool-chain and complete newbie on Scheme :)
I wish this errors to be corrected. Maybe building for iOS is not so important, this errors may a sign of another bug. Please review the codes at the positions.
PS. My environment:
- Mac OS X 10.6 Snow Leopard
- iOS SDK 4.2
- Gambit-C 4.6 source code of version
iOS platform description.
There are 2 kind of iOS platform.
- iOS Device. This is real hardware platform composed of ARM(32bit)+darwin(32bit)
- iOS Simulator. This is simulated platform on Mac OS X. Composed of x86(32bit)+darwin(32bit) This is not a full emulator. It's behaves a little differently with iOS Device platform.
So, Apple offers SDK with 2 versions of development tool-chains. Each version contains modified version of GCC for each platform.
CONTACT
- Hwangbo Hoon
- iPhone: +82 10 4583 3612
- Twitter: http://twitter.com/#!/eonilc
- Blog: http://blog.eonil.com/ (Korean)
CONTACT + Hwangbo Hoon + iPhone: +82 10 4583 3612 + Twitter: http://twitter.com/#!/eonilc + Blog: http://blog.eonil.com/ (Korean)
-
Eonil